Malicious PDF — malware analysis report

Static analysis result for SHA-256 a761cb545edcb4ad…

MALICIOUS

PDF

71.8 KB Created: 2021-01-25 04:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 63a06977d8641cb6083f3ca0390fad10 SHA-1: d174e7d1e2cfea4dc871512641ec316d54f92582 SHA-256: a761cb545edcb4add246c02d66014e57cc346a6de8c79f08c35ab6aa15b7f17b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/123?utm_term=cockles+and+mussels+alive+alive+ho PDF link annotation
    • http://firstsecu-paypal.com/diwefiwisodomugujulr0kwa.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/jeo89jh/torolufitop.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/hcji835/nepeteb.pdfIn PDF document text
    • http://tefulen.iblogger.org/excel_concatenate_between_sheets.pdfIn PDF document text
    • http://klokisik.space/find_my_friends_reporting_wrong_location6cd4p.pdfIn PDF document text
    • http://j3vnci4.xyz/89266889886m4g7q.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/uSUgjji/baby_panda_birthday_party.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/GDAyhi9/giwamile.pdfIn PDF document text
    • http://dibowofu.22web.org/challan_280_in_excel_free.pdfIn PDF document text
    • http://zufunepel.iblogger.org/cocktail_attire_semi-_formal_or_dressy_casual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavunuses.epizy.com/uc_browser_hd_themes.pdfIn PDF document text
    • http://kipafiperugava.epizy.com/expenses_excel_template.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/jutadofiferu.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/adobe_photoshop_for_pc_apk.pdfIn PDF document text
    • http://xafinoligu.epizy.com/jagepijebowevogupe.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/aws_firehose_lambda_transform.pdfIn PDF document text
    • http://nupopejif.epizy.com/zizavapoxutisotuw.pdfIn PDF document text
    • http://bufalirafuma.epizy.com/todogikisudegofokupopa.pdfIn PDF document text
    • http://runesufosufej.rf.gd/rupitopipapezif.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/24647319381.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5112 bytes
SHA-256: 3e7599556fcad0c753cfdf59efbb5f6928fde561fbbf2b7e0c0d0ae2bdf875f7
font_01_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 11948 bytes
SHA-256: c9f5c1f29de344a7fe9cc65dd030fe88aed3df720bcde2eed75c59001c446bfd

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